Jerusalem: The death toll in the Gaza Strip climbed to 121 on the fifth day of Israel's military offensive against Palestinian militants.

With no cease-fire in sight, Israel's military continued amassing troops for a possible ground attack while hammering more than 80 targets in Gaza.

The strikes were made against dozens of rocket launchers and concealed rocket sites and at least 10 militants said to be involved in firing rockets into Israel, military officials said.

Israelis watch as firefighters try to douse a fire from a rocket that hit a petrol station in the southern Israeli city of Ashdod, wounding three. Photo: Getty Images

Among those killed were six people in the home of the sister of senior Hamas official Ismail Haniyeh, the former prime minister of Hamas' government in Gaza and deputy chief of the militant group's political bureau. He reportedly confirmed that two of his nephews were killed in the attack.

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Meanwhile, 60 rockets fired from Gaza slammed into Israel while others were intercepted over crowded urban centres in Israel's south and central cities. Air-raid sirens continued to send millions of Israeli citizens scurrying for shelter.

More than a dozen mobile concrete shelters were deployed in Beersheba on Saturday for residents of the city's old neighbourhood without private or public shelters that took direct hits the day before.

Among the targets struck in Gaza were a bank, a mosque and a center for the disabled, where two people were killed in an overnight strike, Palestinians reported.

Israel's military said the mosque targeted in the Nuseirat area of the Gaza Strip concealed a cache of rockets and served as a gathering point for militants.

As photographs of the destroyed mosque and its devastated residential neighbourhood circulated on social media and in the international press, the Israeli military also circulated what it said was a declassified aerial picture of the mosque.